2. Protozoa

The word "protozoa" mean "little". The most abundant animals in the world are protozoa. Their role in ecology is a very important one. Protozoa also include many parasites. Protozoa have one cell, there are more than 50,000 species in the protozoa group. Most protozoa are found mainly in ponds, soil, lakes and rivers. Some of them eat other microorganisms as food.

There are an example of protozoas

protozoa under microscope

protozoa in the soil

protozoa in the water

Tissue associated by protozoa